Features

• Single Positive Voltage Control 0 to +5 Volts

• 40 dB Attenuation Range at 900 MHZ GHz

• ± 2 dB Linearity from BSL

• Low DC Power Consumption

• Low-Cost SOIC-8 Plastic Package

• Tape and Reel Packaging Available

SOIC-8

1

Description

M/A-COM’s AT-108 is a GaAs, MESFET MMIC voltage

variable absorptive attenuator in a low cost SOIC-8 lead surface

mount plastic package. The AT-108 is ideally suited for use

where linear attenuation fine tuning and very low power

consumption are required. Typical applications include radio,

cellular, GPS equipment and automatic gain/level control

circuits.

The AT-108 is fabricated with a monolithic GaAs MMIC using

a mature 1-micron process.

The process features full chip

passivation for increased performance and reliability.

Ordering Information

Part Number

Package

AT-108

SOIC-8 Lead Plastic Package

AT-108TR

Forward Tape and Reel

1

AT-108RTR

Reverse Tape and Reel

1

Parameter

Test Conditions

1

Units

Min.

Typ.

Max.

Insertion Loss

0.5 - 1.0 GHz

dB

2.5

2.7

1.0 - 3.0 GHz

dB

3.2

3.5

Attenuation

0.5 - 1.0 GHz

dB

40

1.0 - 2.0 GHz

dB

35

2.0 - 3.0 GHz

dB

28

Flatness

0.5 - 1.0 GHz

dB

±0.5

±0.8

(Peak-to-Peak)

1.0 - 2.0 GHz

dB

±1.2

±1.5

2.0 - 3.0 GHz

dB

±1.5

±1.8

VSWR

0.5 - 3.0 GHz

2:1

10% to 90% RF, 90% to 10% RF

µs

15

50% Control to 90% RF, Control to 10% RF

µs

25

Transients

In-band

mV

12

1.

All measurements in a 50

Ω system.

1. If specific reel size is required, consult factory for part number

assignment.

(.19/.25)

CHAMFER

(OPTIONAL

)

(0.40/1.27)

.016/.050

0°/80°

-B-

BSC.

-C-

-A-

.010(.25)

C A

B

M

M

S

.050(1.27)

Oreintation

Mark

.1497/.1574

(3.80/4.00)

M

M B

.010(.25)

.2284/.2440

(5.80/6.20)

.0532/.0688

(1.35/1.75)

.004(0.10)

.0075/.0098

PIN 8

PIN 1

.013/.020 (8

PL)

(.33/.51)

.0040/.0098

(.10/.25)

.1890/.1968

(4.80/5.00)

1. Dimensions are in inches/mm.

AT-108

Voltage Variable Absorptive Attenuator

Voltage Variable Absorptive Attenuator

Voltage Variable Absorptive Attenuator

Voltage Variable Absorptive Attenuator

40 dB, 0.5

40 dB, 0.5

40 dB, 0.5

40 dB, 0.5—

—

—

—3.0 GHz

3.0 GHz

3.0 GHz

3.0 GHz

North America: Tel. (800) 366-2266, Fax (800) 618-8883

Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298

Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020

Specifications subject to change without notice.

Visit www.macom.com for additional data sheets and product information.

V 4.0